Discussion
Why is water a poor solvent for infrared but acceptable for Raman?
Answer: A
Water's hydroxyl bands dominate the infrared spectrum and swamp the sample's, while its Raman scattering is weak and leaves the spectrum clear. It does dissolve salt cells, which is a separate practical nuisance. It certainly has Raman-active vibrations, just weak ones. That one technique tolerates the most important biological solvent and the other does not is a large part of why Raman is used for aqueous and biological samples at all.
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